Call of Duty: Infinite Warfare

Note: This guide is for people that have access to Director's Cut or knows someone that could help that has access to it. Director's Cut allows you to PaP the Venom-X without needing to do the upgrade steps, which allows you to skip over all the annoying/tedious steps.

If you are wanting to get this achievement the normal way, XGodsOfWar has great guides on how to unlock and upgrade the Venom-X.
Link to his YouTube Playlist: https://m.youtube.com/playlist?list=PLLq2jFUhMKQsuCk5sT2FCVk...

Once you start up Beast from Beyond with Director's Cut activated, find a Magic Wheel and keep spinning it until you get the Venom-Y out of it. Director's Cut makes all weapons in the Magic Wheel PaPed. Once the Venom-Y is aquired, unlock the PaP room (you should already know how to unlock it by now) and pay 10,000 points to PaP it to the Venom-Z, which in return will pop the achievement.
Note: You will not get the achievement for acquiring the Venom-X for the first time since you don't get the X version out of the Magic Wheel.

Going off of the previous solution, I have one that requires less luck.
First turn on Director's Cut.
Then you need to do is get the Venom-X normally, using the standard technique. And once you get it, bring it straight to the Pack a punch room and you can pack it twice! No extra steps required